CN114342027B

CN114342027B - Push switch

Info

Publication number: CN114342027B
Application number: CN202080058426.6A
Authority: CN
Inventors: 铃木卓哉; 贞松伊鹤; 舂井克敏; 牧野真也
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2019-09-02
Filing date: 2020-03-17
Publication date: 2025-02-25
Anticipated expiration: 2040-03-17
Also published as: US11984277B2; WO2021044655A1; JP7199553B2; JPWO2021044655A1; US20220230821A1; CN114342027A

Abstract

The present invention relates to a push switch comprising: a housing having a receiving space with an upper opening and a fixed contact arranged at the bottom of the receiving space; a movable contact member arranged in the receiving space, deformed by a pressing force from above, and thereby in contact with the fixed contact; and a pressing member member arranged on the movable contact member and transmitting the pressing force to the movable contact member. The movable contact member has a pair of first straight-line edges extending in a straight line. The pressing member member has a plurality of convex pressing portions arranged on a bottom surface opposite to the movable contact member. The plurality of pressing portions are arranged on the bottom surface at a position that does not overlap with the later-described straight line, which is a straight line that passes through the center of the movable contact member and intersects with each of the first straight lines in the pair of first straight-line edges.

Description

Push switch

Technical Field

The present invention relates to a push switch.

Background

Patent document 1 discloses a push switch in which a top portion of a movable contact member is pushed by a push piece member provided between a cover plate and the movable contact member, and the movable contact member is deformed to be in contact with a center contact portion.

Prior art literature

Patent literature

Patent document 1 Japanese patent application laid-open No. 2018-6021

Disclosure of Invention

Problems to be solved by the invention

However, in the technique of patent document 1, since both side portions of the movable contact member are cut by side surfaces (side cut), when the operation load of the movable contact member is increased without increasing the size of the movable contact member, there is a concern that the stress amplitude of both side portions of the movable contact member increases and cracks are likely to occur in both side portions of the movable contact member.

Means for solving the problems

The push switch according to one embodiment includes a case having a housing space having an upper opening and a fixed contact provided at a bottom of the housing space, a movable contact member disposed in the housing space and deformed by a pressing force from above to contact the fixed contact, and a presser member provided on the movable contact member and transmitting the pressing force to the movable contact member, the movable contact member having a pair of first linear edges extending in a straight line, the presser member having a plurality of convex pressing portions provided on a bottom surface facing the movable contact member, the plurality of pressing portions being provided at positions where the bottom surface does not overlap a straight line intersecting each of the pair of first linear edges through a center of the movable contact member.

Effects of the invention

According to one embodiment, the operating load of the movable contact member can be increased while suppressing an increase in the stress amplitude of both side portions of the movable contact member.

Drawings

Fig. 1 is an external perspective view of a push switch according to an embodiment.

Fig. 2 is an exploded perspective view of a push switch according to an embodiment.

Fig. 3 is an external perspective view showing a bottom surface side of a pressing member according to an embodiment.

Fig. 4 is a plan view showing a pressing position of a metal contact of a pressing member according to an embodiment.

Fig. 5 is a diagram showing a relationship between a distance, an operation load, and a stress amplitude in the push switch according to the embodiment.

Fig. 6 is a diagram showing a relationship between the length of the push switch and the operation load and stress amplitude according to an embodiment.

Fig. 7 is a diagram showing a relationship between an angle of a push switch, an operation load, and stress amplitude according to an embodiment.

Fig. 8 is a diagram showing a first modification of the pressing member according to the embodiment.

Fig. 9 is a diagram showing a second modification of the pressing member according to the embodiment.

Fig. 10 is a diagram showing a comparative example of the operation load of the push switch according to the embodiment and the conventional push switch.

Fig. 11 is a diagram showing a comparative example of stress amplitude of a push switch according to an embodiment and a conventional push switch.

Fig. 12 is a view showing a first example of a presser member used in a conventional push switch.

Fig. 13 is a diagram showing a second example of a presser member used in a conventional push switch.

Detailed Description

An embodiment will be described below with reference to the drawings. In the following description, for convenience, the Z-axis direction is set to the up-down direction in the drawing. The Y-axis direction in the drawing is set to the left-right direction. The X-axis direction in the drawing is the front-rear direction.

(Outline of push switch 100)

Fig. 1 is an external perspective view of a push switch 100 according to an embodiment. As shown in fig. 1, the push switch 100 includes a case 110 having a thin rectangular parallelepiped shape in the Z-axis direction. A cover plate 140 is provided on the upper surface of the housing 110. A dome-shaped operation portion 141 protruding upward is formed at the center of the cover plate 140.

The push switch 100 can be switched between an on state and an off state by a push operation to the lower side of the operation portion 141. Specifically, the push switch 100 is turned off in a state in which the operation portion 141 is pushed, and the first fixed contact 111 (see fig. 2) and the second fixed contact 112 (see fig. 2) provided in the housing 110 are turned off.

On the other hand, the operation portion 141 is pressed downward to press the switch 100 into an open state, and the first fixed contact 111 and the second fixed contact 112 are brought into conduction through the metal contact 120 (see fig. 2). When the push switch 100 is released from the push operation of the operation unit 141, the metal contact 120 automatically returns to its original state by the elastic restoring force. Thus, the push switch 100 automatically turns off.

(Constitution of push switch 100)

Fig. 2 is an exploded perspective view of the push switch 100 according to an embodiment. As shown in fig. 2, the push switch 100 includes a case 110, a metal contact 120, a presser member 130, and a cover plate 140 in this order from the bottom in the drawing.

The case 110 is a container-like member having a rectangular parallelepiped shape. The case 110 has a substantially rectangular shape in which the X-axis direction is the longitudinal direction and the Y-axis direction is the width direction in a plan view from above. The housing 110 is formed with an accommodation space 110A having an upper opening. The housing space 110A has a substantially rectangular shape in which the X-axis direction is the longitudinal direction and the Y-axis direction is the width direction in a plan view as viewed from above. The metal contact 120 and the presser member 130 are accommodated in the accommodation space 110A. For example, the case 110 is formed by insert molding using a relatively hard insulating material (e.g., hard resin).

Four first fixed contacts 111 and three second fixed contacts 112 are provided at the bottom of the accommodating space 110A. Four first fixed contacts 111 are provided at each of four corners at the bottom of the accommodating space 110A. Each of the four first fixed contacts 111 is electrically connected to the metal contact 120 by disposing the metal contact 120 in the housing space 110A and making contact with the peripheral edge portion of the metal contact 120. Three second fixed contacts 112 are arranged at the center of the bottom of the housing space 110A. The three second fixed contacts 112 are in contact with the central portion (i.e., the portion of the inner side of the top portion) of the metal contact 120 when the top portion of the metal contact 120 is deformed into a concave shape, thereby being electrically connected to the metal contact 120 and conducting with each of the four first fixed contacts 111 via the metal contact 120. For example, the first fixed contact 111 and the second fixed contact 112 are formed by machining a metal plate.

The metal contact 120 is an example of a "movable contact member". The metal contacts 120 and 120 are dome-shaped members formed of a thin metal plate. The metal contact 120 is disposed in the housing space 110A of the housing 110.

The metal contact 120 has an outer shape including a pair of first curved edge portions 122 in front and rear directions and a pair of first linear edge portions 123 in left and right directions in a plan view as viewed from above. The first curved edge 122 is a portion extending in a curved shape along a circumference having a predetermined radius. The first linear edge 123 is a portion extending linearly along the X-axis direction. The metal contact 120 is a member having a circular shape in a plan view as viewed from above, and is formed in an outer shape having a pair of first curved edge portions 122 and a pair of first linear edge portions 123 by cutting the left and right side portions in a straight line along the X-axis direction. That is, the metal contact 120 is a metal contact having a long shape with the X-axis direction as the longitudinal direction and the Y-axis direction as the width direction.

The metal contact 120 is in contact at an outer peripheral portion thereof with each of the four first fixed contacts 111 provided at the bottom of the accommodating space 110A, and is electrically connected with each of the four first fixed contacts 111. When the metal contact 120 is pressed by the operation portion 141, if the top portion 121 (central portion) is pressed downward by the presser member 130 and exceeds a predetermined operation load, the top portion 121 is rapidly deformed (inverted operation) into a concave shape. Accordingly, the metal contact 120 is in contact with the second fixed contact 112 provided at the bottom of the housing space 110A through the portion of the back side of the top 121, and is electrically connected to the second fixed contact 112. When the pressing force from the pressing member 130 is released, the metal contact 120 returns to the original convex shape by the elastic force.

The presser member 130 is placed on the top 121 (i.e., the center portion) of the metal contact 120. The presser member 130 is formed using a resin material such as PET. The pressing member 130 has a dome shape with a top 131 at the center and a convex upper part. The pressing member 130 is bonded to the rear side of the top 141A of the operation portion 141 of the cover sheet 140 by any bonding means (for example, laser welding).

The outer shape of the presser member 130 is configured to have a pair of second curved edge portions 132 in front and rear directions and a pair of second linear edge portions 133 in left and right directions in a plan view as viewed from above. The second curved edge 132 is a portion extending in a curved shape along a circumference having a predetermined radius. The second linear edge 133 is a portion extending linearly along the X-axis direction. The pair of second linear edges 133 are parallel to the pair of first linear edges 123 of the metal contacts 120. The presser member 130 is a member having a circular shape in a plan view as viewed from above, and is formed in an outer shape having a pair of second curved edge portions 132 and a pair of second linear edge portions 133 by side-cutting the left and right side portions in a straight line along the X-axis direction. That is, the presser member 130 is a long-shaped presser member having a length direction in the X-axis direction and a width direction in the Y-axis direction.

The cover sheet 140 is a thin sheet-like member placed on the upper surface of the case 110. The cover sheet 140 is formed using a resin material such as PET. The cover sheet 140 has a substantially rectangular shape having a length direction in the X-axis direction and a width direction in the Y-axis direction in a plan view from above. That is, the cover sheet 140 has substantially the same shape as the case 110 in a plan view as seen from above. The cover sheet 140 is bonded to the upper surface of the case 110 by any bonding means (e.g., laser welding, etc.) in a state of covering the upper surface of the case 110. The cover sheet 140 seals the accommodation space 110A by closing the upper opening of the accommodation space 110A of the case 110. A dome-shaped operation portion 141 protruding upward is formed at the center of the cover plate 140. The operation unit 141 is a portion for realizing a downward pressing operation by an operator.

In addition, the center 120P (top 121) of the metal contact 120, the center 130P (top 131) of the presser member 130, and the center 140P (top 141A) of the cover plate 140 overlap each other on the axis AX.

(Construction of the bottom surface side of the pressing Member 130)

Fig. 3 is an external perspective view showing the bottom surface side of the presser member 130 according to one embodiment. As shown in fig. 3, the bottom surface 130B of the presser member 130 is planar.

Further, as shown in fig. 3, the presser member 130 of the present embodiment is provided with each of four pressing portions 134 for each of four corners of the bottom surface 130B. In particular, the four pressing portions 134 are disposed in point symmetry with respect to the center 130P of the pressing member 130 (i.e., the center 120P of the metal contact 120).

Each pressing portion 134 is provided so as to protrude downward from the bottom surface 130B. Each pressing portion 134 has a specific height dimension from the bottom surface 130B. The bottom surface of each pressing portion 134 is planar.

The straight line SL1 shown in fig. 3 is a straight line passing through the center 130P of the presser member 130 and extending in the Y-axis direction, and orthogonal to each of the pair of second straight edge portions 133. Further, a straight line SL2 shown in fig. 3 is a straight line that passes through the center 130P of the presser member 130 and extends in the X-axis direction, and that is parallel to each of the pair of second straight edge portions 133.

As shown in fig. 3, at the bottom surface 130B, each of the four pressing portions 134 does not overlap the straight line SL1 by being provided at each of the four corners.

Each pressing portion 134 has an inner peripheral side surface 134A, an outer peripheral side surface 134B, a side surface 134C, and a side surface 134D. The inner peripheral side surface 134A is a side surface extending along the circumference of a circle having a radius L1, which radius L1 is L centered on the center 130P of the presser member 130. The outer peripheral side 134B is a side extending along the curved edge 132. The side surface 134C passes through the center 130P of the presser member 130 and extends along a straight line at a predetermined angle with respect to the straight line SL 2. The side surface 134D is a side surface extending along the second linear edge 133.

(Pressing position of the metal contact 120 based on the pressing member 130)

Fig. 4 is a plan view showing a pressing position of the metal contact 120 by the presser member 130 according to an embodiment. Fig. 4 shows the presser member 130 and the metal contact 120 in a state of overlapping each other.

As shown in fig. 4, the presser member 130 is provided on the top 121 of the metal contact 120 such that the pair of second linear edges 133 of the presser member 130 and the pair of first linear edges 123 of the metal contact 120 are parallel to each other.

Further, as shown in fig. 4, the presser member 130 is capable of pressing the metal contact 120 at a position further away from the straight line SL1 (i.e., a position not overlapping the straight line SL 1) in the X-axis direction by each of four pressing portions 134 provided at each of four corners (i.e., a position not overlapping the straight line SL 1).

As a result, even when the operating load of the metal contact 120 is increased, the push switch 100 according to the present embodiment can push the metal contact 120 by the presser member 130 so that an increase in the stress amplitude of the first linear edge 123 of the metal contact 120 is suppressed.

(Operating load of Metal contact 120)

In the push switch 100 of the present embodiment, the operation load of the metal contact 120 varies with the distance L1 from the center 130P of the presser member 130 to the inner peripheral side surface 134A of the pressing portion 134, the length L2 of the inner peripheral side surface 134A, and the angle θ of the straight line SL2 with respect to the straight line SL3 as shown in fig. 3. The straight line SL3 is a straight line connecting the center 130P of the presser member 130 and the center 134P of the pressing portion 134. Accordingly, the push switch 100 of the present embodiment can set the operation load of the metal contact 120 to a target value by appropriately adjusting the distance L1, the length L2, and the angle θ of the presser member 130.

Fig. 5 is a diagram showing a relationship between a distance L1 of the push switch 100 and an operation load and stress amplitude according to an embodiment. For example, as shown in fig. 5 (a), the push switch 100 of the present embodiment can further increase the operation load of the metal contact 120 by the "lever principle" by further increasing the distance L1 of the presser member 130. As shown in fig. 5 (b), in this case, the push switch 100 according to the present embodiment can hardly increase the stress amplitude of the first linear edge 123 of the metal contact 120.

Fig. 6 is a diagram showing a relationship between the length L2 of the push switch 100 and the operation load and stress amplitude according to an embodiment. For example, as shown in fig. 6 (a), the push switch 100 of the present embodiment can further increase the operation load of the metal contact 120 by reducing the length L2 of the push member 130 to make the deformation of the portion not in contact with the push member 130 of the metal contact 120 larger. As shown in fig. 6 (b), in this case, the push switch 100 according to the present embodiment can hardly increase the stress amplitude of the first linear edge 123 of the metal contact 120.

Fig. 7 is a diagram showing a relationship between an angle θ of the push switch 100 and an operation load and stress amplitude according to an embodiment. For example, as shown in fig. 7 (a), in the push switch 100 of the present embodiment, by further increasing the angle θ of the presser member 130, the amount of sag in the vicinity of the first linear edge 123 of the metal contact 120 becomes large, and therefore the operation load of the metal contact 120 can be further increased. As shown in fig. 7 (b), in this case, the push switch 100 according to the present embodiment can hardly increase the stress amplitude of the first linear edge 123 of the metal contact 120.

(First modification of pressing member 130)

Fig. 8 is a diagram showing a first modification of the presser member 130 according to the embodiment. The presser member 130-1 of the first modification shown in fig. 8 is provided with respect to the bottom surface 130B, and the pair of pressing portions 135 are point-symmetrical with respect to the center 130P of the presser member 130-1. Each pressing portion 135 has a long shape in the Y-axis direction (the axial direction orthogonal to the pair of second linear edge portions 133) extending along the curved edge portion 132.

Each pressing portion 135 is provided so as to protrude downward from the bottom surface 130B. Further, each pressing portion 135 has a specific height dimension from the bottom surface 130B. The bottom surface of each pressing portion 135 is planar.

The outer side surface 135A of each pressing portion 135 is formed in a curved shape along the curved edge 132. The side surface 135B of the inner side (center 130P side) of each pressing portion 135 is formed in a linear shape extending in the Y-axis direction. That is, the inner side surface 135B of one pressing portion 135 and the inner side surface 135B of the other pressing portion 135 are parallel to each other.

As shown in fig. 8, at the bottom surface 130B, each pressing portion 135 of the pair of pressing portions 135 is provided so as not to overlap the straight line SL1 by being provided along the pair of curved edge portions 132.

Therefore, the presser member 130-1 of the first modification can be pressed by each of the pair of pressing portions 135 at a position (i.e., a position that does not overlap the straight line SL 1) farther in the X-axis direction with respect to the metal contact 120 than the straight line SL1 (i.e., a straight line passing through the center 130P and the intermediate point of the first linear edge 123).

Thus, even when the operation load of the metal contact 120 is increased, the presser member 130-1 of the first modification can press the metal contact 120 such that an increase in the stress amplitude of the first linear edge 123 of the metal contact 120 is suppressed.

(Second modification of pressing member 130)

Fig. 9 is a diagram showing a second modification of the presser member 130 according to the embodiment. In the pressing member 130-2 of the second modification shown in fig. 9, four pressing portions 136 are provided at each of four corners of the bottom surface 130B. In particular, the four pressing portions 136 are disposed in a point-symmetrical manner with respect to the center 130P of the presser member 130-2.

Each pressing portion 136 is provided so as to protrude downward from the bottom surface 130B. Further, each pressing portion 136 has a specific thickness dimension from the bottom surface 130B. The bottom surface of each pressing portion 136 is planar.

Each pressing portion 136 shown in fig. 9 is different from each pressing portion 134 shown in fig. 3 in shape in a plan view from above. Each pressing portion 136 has a linear side surface 136A parallel to the straight line SL1, a linear side surface 136B parallel to the straight line SL2, a side surface 136C extending along the curved edge portion 132, and a side surface 136D extending along the second linear edge portion 133.

Therefore, in the presser member 130-2 of the second modification, two side surfaces 136A opposed to each other are parallel to each other in the two pressing portions 136 adjacent to each other in the X-axis direction. In the pressing member 130-2 of the second modification, two side surfaces 136B facing each other are parallel to each other among the two pressing portions 136 adjacent to each other in the Y-axis direction.

As a result, in the pressing member 130-2 of the second modification, the pressing portions 136 can be formed relatively easily by forming the regions other than the pressing portions 136 into a straight line shape and a concave shape (for example, cutting, pressing, or the like) along the SL1 and SL2 with respect to the bottom surface 130B.

As shown in fig. 9, at the bottom surface 130B, the four pressing portions 136 are provided at the respective corners of the four corners so as not to overlap the straight line SL 1.

Therefore, the presser member 130-2 of the second modification can be pressed by each of the four pressing portions 136 at a position (i.e., a position where the straight line SL1 does not overlap) farther in the X-axis direction than the straight line SL1 (i.e., a straight line passing through the center 130P and the intermediate point of the first linear edge 123) with respect to the metal contact 120.

Thus, even when the operating load of the metal contact 120 is increased, the presser member 130-2 of the second modification can press the metal contact 120 such that an increase in the stress amplitude of the first linear edge 123 of the metal contact 120 is suppressed.

(Comparative example to conventional push switch)

Fig. 10 is a diagram showing a comparative example of the operation load of the push switch 100 according to the embodiment and the conventional push switch. Fig. 11 is a diagram showing a comparative example of stress amplitude of the push switch 100 according to the embodiment and the conventional push switch.

In the graph of fig. 10, the vertical axis represents the operating load of the metal contacts. In the graph of fig. 11, the vertical axis represents stress amplitudes at both sides of the metal contact. In the graphs of fig. 10 and 11, the horizontal axis represents the type of push switch.

Here, "a" is a conventional push switch using the push member 210 shown in fig. 12. Further, "B" is a conventional push switch using the push member 220 shown in fig. 13. Further, "C" is the push switch 100 of the present embodiment using the push member 130 shown in fig. 3. Further, "D" is the push switch 100 of the present embodiment using the presser member 130-1 shown in fig. 8. Further, "E" is the push switch 100 of the present embodiment using the presser member 130-2 shown in fig. 9.

In the present comparative example, a push switch having the same configuration as the push switch 100 of the present embodiment except for a push member is used as a conventional push switch.

As shown in fig. 10, the push switch 100 ("C", "D", "E") of the present embodiment can increase the operation load of the metal contact 120 as compared with the conventional push switch ("a", "B"). As shown in fig. 11, the push switch 100 ("C", "D", and "E") according to the present embodiment can equalize or reduce the stress amplitude of the first linear edge 123 of the metal contact 120 as compared with the conventional push switch.

(First example of a pressing member used in a conventional pressing switch)

Fig. 12 is a view showing a first example of a presser member used in a conventional push switch. As shown in fig. 12, the conventional presser member 210 has a circular shape in a plan view. The bottom surface 210A of the presser member 210 is circular and planar. That is, the pressing member 210 presses the top of the metal contact through the entirety of the circular bottom surface 210A.

(Second example of pressing member used in conventional pressing switch)

Fig. 13 is a diagram showing a second example of a presser member used in a conventional push switch. As shown in fig. 13, the conventional presser member 220 has a circular shape in a plan view. The bottom surface 220A of the presser member 220 is circular and planar. An annular pressing portion 221 is formed on the bottom surface 220A along the outer peripheral edge of the bottom surface 220A. The pressing portion 221 is a portion protruding downward from the bottom surface 220A and having a specific thickness dimension from the bottom surface 220A. That is, the pressing member 220 presses the top of the metal contact by the entire annular pressing portion 221 of the bottom surface 220A.

As described above, the push switch 100 according to the embodiment includes the case 110 having the housing space 110A having the upper opening and the first fixed contact 111 provided at the bottom of the housing space 110A, the metal contact 120 disposed in the housing space 110A and deformed by the pressing force from above to be in contact with the first fixed contact 111, and the presser member 130 provided at the top 121 of the metal contact 120 and transmitting the pressing force to the metal contact 120. The metal contact 120 has a pair of first linear edge portions 123 extending in a linear shape. The presser member 130 has a plurality of convex pressing portions 134 provided on the bottom surface 130B facing the metal contact 120. The plurality of pressing portions 134 are provided at positions not overlapping the straight line SL1 on the bottom surface 130B, the straight line SL1 passing through the center 120P of the metal contact 120 and intersecting each of the pair of first linear edge portions 123, 123.

As a result, even when the operating load of the metal contact 120 is increased, the push switch 100 according to the present embodiment can push the metal contact 120 by the presser member 130 so that an increase in the stress amplitude of the first linear edge 123 of the metal contact 120 is suppressed. Therefore, the push switch 100 of the present embodiment can suppress the occurrence of cracks or the like in the metal contact 120, and thus can realize a longer life of the metal contact 120.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention described in the patent claims.

For example, in the push switch of the present invention, the presser member may be a member that has not been cut by the side surface (that is, a member that does not have a pair of second linear edges and is circular in plan view) as long as it has at least a plurality of pressing portions.

The pair of first linear edges 123 of the metal contact 120 is not limited to a straight line in mathematical meaning, and may have a large R shape to the extent that they can be regarded as a straight line.

The present international application claims priority based on japanese patent application No. 2019-159864 filed on day 2 of 9 in 2019, the entire contents of which are incorporated by reference into the present international application.

Description of the reference numerals

100. Push switch

110. Shell body

110A accommodating space

111 First fixed contact (fixed contact)

112 Second fixed contact

120 Metal contact (Movable contact part)

120P center

121. Top part

122. A first curved edge part

123. A first linear edge part

130. 130-1, 130-2 Press part

130B bottom surface

130P center

131. Top part

132. A second curved edge part

133. A second linear edge part

134. 135, 136 Pressing part

140. Cover plate

141. Operation part

141A top

SL1 straight line

SL2 straight line

Claims

1. A push switch is characterized in that,

The device is provided with:

a housing having an accommodation space with an upper opening and a fixed contact provided at a bottom of the accommodation space;

A movable contact member disposed in the accommodation space and deformed by a pressing force from above to contact the fixed contact, the movable contact member having a dome shape formed of a thin metal plate, and

A pressing member provided on a dome-shaped top portion of the movable contact member at a center of the movable contact member in a plan view and transmitting the pressing force to the movable contact member,

The movable contact member has a pair of first linear edge portions which are provided to be line-symmetrical and opposed to each other, and a pair of first curved edge portions which are provided to be line-symmetrical and opposed to each other,

The presser member has a pair of second linear edge portions which are provided in line symmetry and parallel to the pair of first linear edge portions, and a plurality of convex pressing portions provided on a bottom surface facing the movable contact member,

The plurality of convex pressing portions are provided at positions where the bottom surface does not overlap a straight line passing through the center of the movable contact member and intersecting each of the pair of first linear edges, and the plurality of convex pressing portions are provided so as to be point-symmetrical with respect to the center of the movable contact member in a plan view.

2. The push switch of claim 1, wherein,

The pressing member is provided with the convex pressing portions at each of four corners of the bottom surface, each of the corners having a corresponding convex pressing portion of the plurality of convex pressing portions.

3. The push switch of claim 1, wherein,

The presser member has:

A pair of curved edge portions extending along the same circumference, and

A pair of the convex pressing portions extends along each of the pair of curved edge portions, each of the curved edge portions having a corresponding convex pressing portion of the plurality of convex pressing portions.

4. The push switch of claim 2, wherein,

Each of the plurality of convex pressing portions is provided so as not to closely contact each other.

5. The push switch of claim 1, wherein,

The center of the movable contact member is located at a position coincident with the center of the presser member in a plan view.

6. The push switch of claim 1, wherein,

The pair of first linear edge portions are line-symmetrical with respect to a virtual line, and the virtual line is the same distance from the pair of first linear edge portions and is parallel with respect to the pair of first linear edge portions.

7. The push switch of claim 1, wherein,

The pair of first linear edges have the same length.

8. The push switch of claim 1, wherein,

The presser member is provided so as to entirely overlap the movable contact member in a plan view.